The distribution of the length of boats has a bell shaped with a mean of 4 inches and a standard deviation of 0.007 inches A about 68% of bolts manufactured will be between what lengths B what percentage of both will be between 3.986 inches and 4.014 inches. C  if the company discards any boards less than 3.986 inches or greater than 4.014 inches what percentage of bolts manufactured will be discarded D what percentage of Bolts manufactured will be between 4.007 inches and 4.021 inches